Which of the following is a type of in-circuit component test?

The correct choice is related to the capability of testing components while they are still connected within a circuit. In-circuit component tests are designed to evaluate the functionality of individual components without requiring them to be removed from the circuit.

The relay coil voltage test specifically checks whether the relay coil in the circuit receives the appropriate voltage when energized. This test is essential for ensuring that the relay operates correctly when called upon to switch the circuit. By measuring the voltage in situ, this test can determine if there are any voltage drops or if the coil is functioning as intended, providing immediate feedback about the state of the relay in the actual operating conditions of the circuit.

In terms of the other options, while high-voltage tests generally assess the integrity of insulation and can be crucial for safety and performance verification, they do not specifically pertain to in-circuit testing. Continuity tests evaluate the path of current flow and check for breaks but are usually more of a preliminary step in troubleshooting rather than a direct evaluation of component function under circuit conditions. Insulation resistance tests determine if the insulation of a component is intact but are typically conducted with the circuit powered down and would not qualify as in-circuit testing either.

Thus, the relay coil voltage test is the most relevant choice as